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"To launch our national rebuilding, I will be asking Congress to approve legislation that produces a US$1 trillion investment in infrastructure of the United States - financed through both public and private capital - creating millions of new jobs."

The American Society of Civil Engineers has graded US infrastructure at D+ and estimated the country needs to invest US$3.6 trillion by 2020.

US Transportation Secretary Elaine Chao told Fox News last month that the needs for infrastructure are so great the federal government cannot shoulder all the costs.

"Public private partnerships are a very important part of a new way of financing our roads and bridges that are in disrepair and our very dangerous," Ms Chao said.

In January, Mr Trump signed an executive order aimed at expediting environmental reviews and approvals for all infrastructure projects, especially high priority projects "such as improving the US electric grid and telecommunications systems and repairing and upgrading critical port facilities, airports, pipelines, bridges, and highways."